Rimes is already a stepmom to Mason, 10, and Jake, 6, her husband's two sons with ex-wife Brandi Glanville. In May, the "Spitfire" singer told Us Weekly that she's not in a rush to start a family of her own yet.

"I was just with the kids for the last two days taking care of them on my own, and trust me . . . I have a newfound respect for working moms who do it all by themselves," Rimes added about caring for the boys. "It was my birth control for a little bit -- so overwhelming!"

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